The phase transition described by \(\rho (\beta ;\sigma )\)  can be seen as the result of two distinct phenomena: (i) location shift controlled by \(\mu \) , and (ii) heteroscedasticity controlled by \(\sigma ^2\) . Roughly speaking, increasing the effect of either (i) or (ii) eases detection and reduces the phase transition curve, as seen in Figure REF . We refer to [1]} for a comprehensive discussion on the effect of (ii) on the phase transition curve. In view of our results, the aforementioned discussion from [1]} is relevant to any ALC model – not only to the normal means model of [1]} which we considered in Section REF .
